Four identical charged particles (q = +10.3 μC) are located on the corners of a rectangle as shown in the figure below. The dimensions of the rectangle are L = 60.6 cm and W = 16.0 cm. (a) Calculate the magnitude of the total electric force exerted on the charge at the lower left corner by the other three charges. N (b) Calculate the direction of the total electric force exerted on the charge at the lower left corner by the other three charges. ∘ (counterclockwise from the +x-axis)